| 摘要 |
A method for determining a reference position for a pipetting needle which is part of an automatic analytical apparatus. The method comprises the following steps:
(i) a first measuring step for measuring a first displacement error (”X) in a displacement of the pipetting needle (72) effected by a transport device,
(ii) a first correcting step for correcting the first displacement error (”X) by means of a corresponding correction of an angular error (Õ) of the initial angular position of the pipetting needle,
(iii) a second measuring step for measuring a second displacement error (”Y) in a displacement of the pipetting needle in a second direction (Y-axis) perpendicular to the vertical plane,
(iv) a second correcting step for correcting the second displacement error (”Y) by means of a corresponding change (±) of the angular position of the pipetting needle along a circular path,
(v) a third measuring step for determining the position of a vertical reference line, and
(vi) a fourth measuring step for determining the position of a reference point ((X 0 , Y 0 , Z 0 ) along said reference line, |
